Interface to empty

I want to know how I can click on an image on my interface, which I already made so it can add an object to the scene from an empty that is in the scene., without using a script. I know you might wonder why I am trying this. Of course I should add that I am still using 2.49b. The newer versions of BGE are buggy on my system.

digiman

have you considered update/upgrade you system so you can run newer versions of blender ?

Of course but 2.7 is buggy on my system.